Constbuction for inductances



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, A, F. HENNINGER, JR

coNsTRUcToN FOR INDUGTANCES Filed Aug. 11, 1924 lTofaZZ whom/it may concern.'

v Beit known 4that I, ANDREW s GER, Jr., a citizen of the United States, and a l y"resident ofthefcity of Chicago, county of wCoolfand State ofIllinois, 'have invented Patented Aug. 2s, 192s. t

ji'S-TATES PATIENT err-leaf ANnnnw I. HnNNnrenn, .111,01* fcnIcAGo, InLINoIs, AssIeNon, n! DIRECT AND A MESNI. AssIGNxnNrs, 'ro 'rnomrs 1I. BRENNAN, `or cIIIcAeo', ILLINOIS..

" n y coNs'rnUcrIoN non INnuesencias.` f

F. HENNIN- rcertainnew'anduseful Improvements in a f' Construction forln'ductances, of which the llj` ject vthe rovisionof 'an 1m roved structurey fofthis c 'aracter which Wi 1 be highly eiiifollowing is a specification.

^ "My invention `relates to a 'construction for inductaiices, `and has 'for' its'principal ob` cient in use and economical in manufacture.

Y' js y One ofthe main objects of my invention is "of the character described, in which the coils the provisionvofan improved construction areis mounted and relatedA as to reduce or 'to tend .to reduce, to minimum the losses l of' electrical energydue to dielectric absorption, to Adielectric lealiage and to inter-turn provision ofa construction of this char- ".Theinvention vv acter which is designed especially to dimin- ,r ,25,

ish thelosses of electrical'energy and as wel] Other objects willappear hereinafter.

` The invention consists in the combinations and arrangements of parts' hereinafter de-r scribed 'and claimed.

ill' be best understood by reference to the accompanying drawings forming `a part ofthis specification, and in which, l

Fig. 1 is) ay sideelevationalfyiew ofa construction made Iaccordene"e, with my im- 1 telepholfr'vf lid4` Wljlss, t

@be readily understoodthatxloss Uofelectric l ener". f 'withfthe `disturbing.` results lWhicl .cipally to windn vthe inducta-nces upon an is a certain amount of 'energy depletion, va-

, Proyemeritsfa ,i I, y 1

` F1g. 2 '1s `an end :elevation thereof; 4and Fig. 3 is 'across sectlonalview, taken subv stantiallyonythe line ofFig. 2. y By those familiar'. "tnthe artof Wireless telegrephy, .it will iiw t erefrom, is in most instances due prininefficientIdielectrl@` Inl alldielectrics, there Aminmin ma Annan, i924. semi No. 131,331.

rying with the`v amount of material and thev method'of'its constructioon. 'In radio sets,

dielectric loss ofenergy' is frequently attended by most undesirable results. For example, 1n a radio receiving set, employing radio frequency amplification andra. tuned inductance for each sta e of radio frequency amplification, energy losses in the tuning inductances and` in each tuned radio frequency transformer decrease ap reciably the range of reception and avifect vo urne and selectivity. The sensitivity' of a vacuum tube detectorl is pro `rti'onal to thev square of the Vvoltage applie to it. If, therefore, half of the incoming energy is lostv in the tuning inductances, `the signal strengtninthe plate circuit ofthe detector tube will be rbut onefourthofvvhat it should be.y Again, infview of the powers of amplification of the audio ampliier,y it `vvill bei apparentthat aA slight decrease in the energy as applied yto the grid of the detectorftube, will .causen heavy decrease of volume in the output of the two stage audio frequency amplifier.. I

In referring with ,particularity tothe embodinient of my invetion illustrated in the accompanying drawing, itwill be seenjvthat the construction: includes t'wo end 'rings 4 and 4 K'Which' are yconnected at equi-spaced l intervals by 4 pairs of strips 5v end of ywhich 5 represent inner strips, ,being se.-

curedtoythe rings on the inner periphery thereof while y5 represent outer strips b eing secured tothe rings on the outer f eriphery thereof. The rings and the strips are. all made of insulation material, 'preferably of bakelite. Through eachpair of outer yand inner strips and the interveninlr rings are passed bolts -6 having vthreads portions for ,the reception of'securing nutsA 7, ,whereby .these `parts .are 'detachabl Secured together. vIn this manner I'provide .Eachl ofthe inner strips 5 is provided on its .inner face with are'cess 8 of a depth suitthe recesses of-thestrips, secure to each asimple, lightslie eon frame of cylin'drc'zal i form, and one in W ch the solid dielectric is reducedv approximately to `a minimum..

' therein.

stri an insulating bridging member 10, the

od of securement consisting preferably in the use yof celluloid cement.,

Before the outer strips are secured in place I wind upon the inner strips another `or ,secondary coil, 11. lObviously', the num- Wit recesses 12,. adaptedy to receive thc'end rings. The horizontalwalls defining these lrecesses are not made parallel with the end rings, but the same'arc fashioned atan angle ,'theretoAin-,the-form of anoutward inclination so lthat the regions indicated at 13 will vbeef lessthickness `than the regions indiz :cated at 13'., y'In consequenceI of these forma- `tions, the outer strips f5' lwhen they are ,d rawn' down tightly on the end rings by the ,'screw connections 6, haye ya tendency to be -between ,the yend rings Atowards the A strips 5, sothat the turns ofthe inter- Suf` zilimeretrpa coiliare lextended to ,t e points'14 and 15 'engaged coil will beheld uniformly in Vthe 'tionslat which ythey arc wound upon the Pom vTheo positeends of the i.; where'tlieyare soldered to thescrews as 6 in 'order to rovide terminals.

The op 'osite .ends of v.t e'otherfcoil '11 are 'texten ed to other convenient boltsf as''lto r'ovide'ter, 'minals 16Y and 17. With thebo ts`6 arcsecured lugsmr anchor plates 18 to which arts n I -to-besupportedon'orin connection wit the structure may be attachedor soldered as dexsired. The structure is supportedfupon brackets, 1 9r formed. with lfeet 19 ,which may Vlbe secured uponfa' base' board as 20, or 'upon y aysuitable support off the radio instrument inl'whicli ,thestructure is to be incorvporated.

From .the foregoing description, taken in connection with ,the accompanyin drawing,

i itivillbe seen that I have' provi ed a very .50 if ,fp'l'oyed V'as the dielectric with only relatively slight pointso't' solid dielectric support for simpleconstruction, in which -air is emthc coils, so ythat through aflessening ofthe osses of'elec'trical energy, there willA be a substantial'improvement mthe operation of theradio sets, `and' further sc that there -will be less yinterference -from4 distant stations by 'i nearer", 'and more powerful stations transmitting on a'different wave length.` f' `While I have illustrated and described the ,i ,preferred form of construction'for carr -ing my invention `into effect, this 1s capab e of.,

lfait,

variation and modification without departfin'g ,froin' the 'spirit of the invention. I, therefore, do not wish'to be hunted tothe 11a-snee# aving described my invention, what claim as new and desire to secure by Letters Patent is:

1. A coil supportcomprising a plurality of relatively thin and narrow bars of dielectric material on which the coilis mounted, a

rings being mounted on said bars adjacent each end of the coil,'a. plurality of bars of dielectric material positioned on said coil opposite said first mentioned bars notches formed adjacent the ends of said iast mentioned bars, said'notches havin anfangular ywall engaging said rings and lts extendmg through' said bars and rings whereb the coil is com ressed between the bars an the latter are substantially as described. y

2. A coil support comprisin .a plurality of relatively thin and narrow ars of dielectric material on lwhich the coil is mounted, a pair of rings of dielectric material of substantially the same diameter as the coil, said rings being mounted on said bars adjacent to each end of the coil, a plurality of bars of dielectric material positioned on said coil opposite said first mentioned-bars, notches formed on the inner faces of the end por tions of said lastmentioned bars, said notches accommodating the end rings and being of suiicient depth to permit the, opposing faces of the first and second mentioned bars to firmly clamp the convolutions of the coil between them notwithstanding the increased thickness'of the rings as com ared to the wire of the coil, and means for rmly clamping the first and second mentioned bars towards each. other, substantially as described.

3. A coil support comprising a plurality of relatively thin and narrow bars of dielectric 'material on which the coil is lmounted, a `ring ofdielectric material of substantially the same diameter as the coil, said ring being mounted on said bars adjacent to one end o the coil, a plurality of bars of dielectric materi-al positioned on said coil opposite to said first mentioned bars, one set of bars being recessed 'to receive the ring to permit approach ,of the opposing faces ofthe bars, towards each; other suiiicientl close to en-V sure direct clamping action o said faces on pair of rings of dielectric material of sub'- stantially the same, diameter as the coil, said eld in true circular formation,

the convolutionsaof the coil notwithstanding the increased thickness of the` ring as coni` pared to the Wires of the coil, substantially as described.

VIn testimony whereof I have 'signed my' named to this specification.

ANDREWF, Burmese@ 

